This is an open TLD; any person or entity is permitted to register. Though originally intended for use by for-profit business entities, for a number of reasons it became the "main" TLD for domain names and is currently used by all types of entities including nonprofits, schools, and private individuals. Domain name registrations may be successfully challenged if the holder cannot prove an outside relation justifying reservation of the name[citation needed], to prevent "squatting". It was originally administered by the United States Department of Defense.

is an open TLD; any person or entity is permitted to register. Originally intended for use by domains pointing to a distributed network of computers, or "umbrella" sites that act as the portal to a set of smaller websites.

The .edu TLD is limited to specific higher educational institutions such as, but not limited to, trade schools and universities. In the U.S., its use was restricted in 2001 to post-secondary institutions accredited by an agency on the list of nationally recognized accrediting agencies. This domain is therefore almost exclusively used by American colleges and universities. Some institutions, such as the Exploratorium, that do not meet the current registration criteria have grandfathered domain names.

Open TLD; any person or entity is permitted to register; however, registrations may be challenged later if they are not held by commercial entities in accordance with the domain's charter. This TLD was created to provide relief for the .com TLD, where many names have already been taken.

Open TLD; any person or entity is permitted to register; however, registrations may be challenged later if they are not by individuals (or the owners of fictional characters) in accordance with the domain's charter.

"All registrants within the .pharmacy gTLD are vetted prior to registration to confirm that they meet all applicable regulatory standards, including pharmacy licensure and valid prescription requirements, in the jurisdictions where they are based and where they serve patients."[73]

This TLD is intended primarily for engaged couples on a short-term basis (two years with prohibitive third-year renewal fees for second-level domains).[88]
And although the registry is advertising for multiple world languages, all domains appear to need to be in Latin script.[89]

An open TLD, any person or entity is permitted to register. Conceived for those cited in one of the Who's Who reference titles published around the world, the registry was opened for use by private individuals, and for-profit and nonprofit entities, including those with social media aspirations. Registry policies allow for rapid takedown of non-compliant domains, for violations including imposturous registration of another's names, and proscribed uses, including pornography or adult services/applications.